Sports Island DS - 2nd of May
Lego Harry Potter – 3rd of May
Picross 3D – 3rd of May
Game Hits – 4th of May
Monster Racers – 4th of May
Thomas & Friends: Hero Of The Rails – 4th of May
Dementium II -5th of May
Iron Man 2 – 5th of May
Earthworm Jim – 10th of May
Photo Dojo – 10th of May
Aztec Treasure Hunt – 11th of May
Puzzle Quest 2 – 11th of May
Frogger Returns – 17th of May
Trackmania DS 2 – 17th of May
Blue Dragon: Awakened Shadow - 18th of May
Shrek Forever After - 18th of May
Prince of Persia: The Forgotten Sands – 18th of May
Metal Torrent 24th of May
Backyard Sports: Sandlot Sluggers – 25th of May
Dawn of Heroes – 25th of May
Let's Play Ballerina - 25th of May
Let's Play Garden - 25th of May
Tetris Party Deluxe - 25th of May
Thinksmart - 25th of May
Thinksmart Advanced - 25th of May
Thinksmart Family - 25th of May
Windy x Windam - 25th of May
Yard Sale Hidden Treasures: Sunnyville - 25th of May
Hero of Sparta - 25th of May

Modern Warfare 2: Stimulus Package – 4th of May
Total War Battle Pack – 4th of May
Rig N Roll – 7th of May
Age of Conan: Rise of the Godslayer – 11th of May
Rocket Knight – 12th of May
Gundemonium Collection – 18th of May
Lost Planet 2 – 18th of May
Split Second – 18th of May
Runaway: A Twist of Fate – 18th of May
Silas – 20th of May
Grey Matter – 21st of May
Backyard Sports: Sandlot Sluggers – 25th of May
Blur – 25th of May
Making History II: The War of the World – 25th of May
Sniper: Ghost Warrior – 25th of May
Chime – May 2010
Puzzle Chronicles – May 2010
Tropico 3: Absolute Power – May 2010 

Modern Warfare 2: Stimulus Package – 4th of May
Iron Man 2 – 5th of May
3D Dot Game Heroes 11th of May
Batman: Arkham Asylum GOTY - 11th of May
Lost Planet 2 – 11th of May
Skate 3 – 11th of May
SBK: Superbike World Championship – 11th of May
Gundemonium Collection – 18th of May
Prince of Persia: The Forgotten Sands – 18th of May
Red Dead Redemption – 18th of May
Rocket Knight – 18th of May
Split Second – 18th of May
Shrek Forever After – 18th of May
Backbreaker – 25th of May
UFC Undisputed 2010 – 25th of May
Blur – 25th of May
ModNation Racers – 25th of May
Lead and Gold: Gangs of the Wild West – May 2010

Fat Princess: Fistful of Cake – 4th of May
What Did I Do To Deserve This, My Lord? 2 – 4th of May
Iron Man 2 – 5th of May
Mahjong Solitaire – 11th of May
Naruto Shippuden: Ultimate Ninja Heroes 3 – 11th of May
Prince of Persia: The Forgotten Sands - 18th of May
Hexyz Force – 25th of May
ModNation Racers – 25th of May
Tehra: Dark Warrior – May 2010
Vektar Beat – May 2010

Iron Man 2 – 4th of May
Zeno Clash: Ultimate Edition – 5th of May
Skate 3 – 11th of May
Batman: Arkham Asylum GOTY – 11th of May
Lost Planet 2 - 11th of May
Rocket Knight – 12th of May
Shrek Forever After – 18th of May
Attack of the Movies 3D – 18th of May
Split Second – 18th of May
Red Dead Redemption – 18th of May
Alan Wake - 18th of May
Prince of Persia: The Forgotten Sands – 18th of May
Backbreaker – 25th of May
Backyard Sports: Sandlot Sluggers – 25th of May
Blur – 25th of May
Sniper: Ghost Warrior – 25th of May
UFC Undisputed 2010 – 25th of May
Ben 10 Alien Force: The Rise of Hex – May 2010
Puzzle Chronicles – May 2010
The Swarm – May 2010

Dance Sensation! – 4th of May
Family Gameshow – 4th of May
Iron Man 2 – 5th of May
Satisfashion – 8th of May
Satisfashion 10th of May
Bit.Trip Runner - 17th of May
Trackmania - 17th of May
Prince of Persia: The Forgotten Sands – 18th of May
Shrek Forever After – 18th of May
Trauma Team – 18th of May
Attack of the Movies 3D – 18th of May
Super Mario Galaxy 2 – 23rd of May
Let's Play Ballerina – 25th of May
Let's Play Garden – 25th of May
Pirates Plund-Arrr – 25th of May
Tetris Party Deluxe – 25th of May
Adventures of Sherlock Holmes: The Silver Earring – May 2010
Ben 10 Alien Force: The Rise of Hex - May

Source: http://meodia.com/news/1023/complete-list-of-game-releases-for-may-2010/